1. Department of Mathematics, Brunel University London, Kingston Ln, Uxbridge, UB8 3PH, United Kingdom
2. Phytoform Labs Ltd., Lawes Open Innovation Hub, West Common, Harpenden, Hertfordshire, England, AL5 2JQ, United Kingdom
3. Department of Physics and Astronomy, Dartmouth College, Hanover, New Hampshire, 03755, USA